Optical methods and systems for detecting a constituent in a gas containing oxygen in harsh environments
a technology of optical methods and systems, applied in the field of sensors, can solve the problems of poor device stability, low selectivity, and more apparent challenges
Inactive Publication Date: 2009-08-20
THE RES FOUND OF STATE UNIV OF NEW YORK
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Problems solved by technology
Although existing sensing technologies based on solid electrolytes, oxide semiconductors, and field effect devices exhibit significant potential for sensing applications at intermediate temperatures, e.g., below 600° C., there are challenges associated with poor device stability and low selectivity.
Moreover, these challenges are more apparent at temperatures above 600° C.
Method used
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[0061]The present invention is directed to sensors for use in high temperature applications above about 400° C. Such applications may include monitoring solid oxide fuel cells (e.g., at temperatures between about 500° C. and about 800° C.), monitoring jet turbine engine emissions (e.g., at about 500° C. to about 800° C.) or other combustion related environments.
[0062]In one aspect, the present invention is directed towards extending the operational range of Au nanoparticle based sensing of CO up to about 500° C., to about 600° C., and to about 800° C. through the use of a materials system comprised of Au nanoparticles embedded in an yttria (Y2O3) stabilized zirconia (ZrO2) matrix. A reversible change in the optical properties of such a gold-yttria stabilized zirconia nanocomposite (Au—YSZ) is observed upon exposure to gas cycles of air and an air / CO mixture. The sensing mechanism has been attributed to interfacial charge transfer chemical reactions occurring at the perimeter of the ...
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A method for detecting a gas phase constituent such as carbon monoxide, nitrogen dioxide, hydrogen, or hydrocarbons in a gas comprising oxygen such as air, includes providing a sensing material or film having a metal embedded in a catalytically active matrix such as gold embedded in a yttria stabilized zirconia (YSZ) matrix. The method may include annealing the sensing material at about 900° C., exposing the sensing material and gas to a temperature above 400° C., projecting light onto the sensing material, and detecting a change in the absorption spectrum of the sensing material due to the exposure of the sensing material to the gas in air at the temperature which causes a chemical reaction in the sensing material compared to the absorption spectrum of the sensing material in the absence of the gas. Systems employing such a method are also disclosed.
Description
PRIORITY INFORMATION[0001]This application claims priority from pending U.S. Provisional Application No. 60 / 785,025 filed on Mar. 23, 2006, entitled “Optical Methods Using Au—YSZ Nanocomposites For Detecting A Gas In Harsh Environments”, the entire subject matter of which is incorporated herein by reference.GOVERNMENT RIGHTS[0002]This invention was made with Government support under contract number DE-FG26-04NT42184 awarded by the United States Department of Energy. The Government has certain rights in the invention.FIELD OF THE INVENTION[0003]This invention relates generally to sensors, and more specifically to high temperature compatible optical gas sensors.BACKGROUND OF THE INVENTION[0004]Environmental concerns associated with the use of fossil fuels have stimulated efforts towards developing various gas sensors. Although existing sensing technologies based on solid electrolytes, oxide semiconductors, and field effect devices exhibit significant potential for sensing applications...
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Login to View More IPC IPC(8): G01N21/00
CPCG01N21/31G01N21/7703G01N21/783G01N33/0036Y10T436/205831G01N33/004G01N33/0047G01N33/005G01N33/0037Y02A50/20
Inventor CARPENTER, MICHAEL A.SIRINAKIS, GEORGE
Owner THE RES FOUND OF STATE UNIV OF NEW YORK